To \( 1.0 \mathrm{~L} \) solution containing \( 0.1 \mathrm{~mol} \...

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To \( 1.0 \mathrm{~L} \) solution containing \( 0.1 \mathrm{~mol} \) each of \( \mathrm{NH}_{3} \)
P and \( \mathrm{NH}_{4} \mathrm{Cl}, 0.05 \mathrm{~mol} \mathrm{HCl} \) is added. The change in

W \( \mathrm{pOH} \) will be \( \left(\mathrm{pK}_{\mathrm{b}}\right. \) for \( \left.\mathrm{NH}_{3}=4.74\right) \)
(1) 0.30
(2) -0.30
(3) 0.48
(4) -0.48
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